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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0fe0f495f249ee8df5c92d09e08d588ef306ec599c223635ea52f86edfe3a1' 
  AND token = '95EKD8edFVeVB2oDi6oKQuxV5t3RsD+keWZnhhBQlxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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