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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764967610aa2699206a4249b0f8149af6ed4d95942e7ea116a542cc3589afc52' 
  AND token = 'CvoIuSX0kYaSLG7j45GeQ7M7nIthd8U03d3PiI2dpAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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