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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed50aa0bdcdecad206217b4eb51c3596d21a35979700e93bf76c9f055ca5de06' 
  AND token = 'P3Jdy3c95EBznn5LpplF9ELdYNAEGJaulqI/L6wMt/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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