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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b389b631e38417d36ce7bf59fa41311d304e26dbd1c09e224711259c0c9afe2a' 
  AND token = 'cJEn/G15VUIvWRLcFXvVT8++9GNib3Fk3MdJXZR65A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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