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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55561ae31d2b4e8fda5514d02c6983bea9199115b61a8d993d29449c7ee5f2b' 
  AND token = 'g5iXriAFrZK7IF8trHYPTo61gyizRlwUT1i9ms773kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}