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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e0e1e33192a79333d71361d6ea9d75fcb38553058f99e04877115fdd315a61' 
  AND token = 'buQcHyDNK8lyvc/FQJwPWo7l/HU4JcT8GPk7e71JUuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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