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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a585b13f0d03ba36b195716844a8e4f525c4f480ed3d683900e782e9bb90fb21' 
  AND token = 'n8HcuI3IrzH4UMHOG5ROzxLHBhny3sR4urHhjhOcJoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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