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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17ae11bbd2f016b3307919076c2fcb6e04e7c62091c203a958a0cb9bd22fdb7' 
  AND token = 'gCodPz9yC3vqT1PePqo6xa7s7S9/zbODcLVOosSLdIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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