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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1890684b979ecc57aae24059f0a8ccb28eac2767f06e0e953e3b6fc6c36dfd1b' 
  AND token = 'fW9cOOBJiSlkmaYNojn1pkV3Gvy1ivqWhUjvnaDzU/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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