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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bee74c5597c676d427ba81b0176aac02a275f340148aa953f66a1ba11d02751' 
  AND token = '7NfCYl98WJGmiRy+vL2W9G3A46rDl8/Nrka1Ig2Puns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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