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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89425b9056d9cb576ed2c02c738fca3b626da04e4060ac33f15c4dff78f9477' 
  AND token = 'bco1dRxL2mYSSuvrZPbapT12G4wm+w3PQQDXL3tR838=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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