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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b054b51b20f08cb7e07bf102222d7aa2bb796d04ddbbdbe268e0cc60b5cc3c5' 
  AND token = '45fC1rMb9UaFNq4437g7/CKRQF8y1k+Wb/L6cujuxjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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