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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f188864d912e44d398ad9495ad8eb1d01ba268511ef6bfa8ae643bfd1e64d8c4' 
  AND token = '0fBK1LaHMiJJEv2gMa90M5g/Oh9PgqKseGU0NVPqzJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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