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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a12ba096c68e4a031c033d02855246918be7500e9c63be0bf782b3432ec5735' 
  AND token = 'N/pNWjA5U+Gc18YaTL7tdHymLOpNaD3ZwYP+R5vRqx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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