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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4665c27dd0a2813f1478d9c245a0c8b78931b022f0706bbddc8be5e863b106' 
  AND token = 'Ba/2vF7s4t0y4zDfG2E1cjSAj3O7Q5A5OI4OXsFv4Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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