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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11c535c504f1de7b968fad5db5f1633daa32608fad28067e4900c79731aebe4' 
  AND token = 'mU2UEcMcZIVw4AzYEqrS5yk15ZF21Djd3hnpS97uU4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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