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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698dadd57f57ea899542bdb76696985c7e80c5356424fa96facd227f38f7632f' 
  AND token = '10IP/KBx0ZS1soD7YIP3e7Di+RjFXLCPoFtGEjkoX/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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