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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9ce89e3d320040d41881f8e70c8c3cc2c1676331b3f5308a69f07a787c6ad5' 
  AND token = 'HfJ0NTk43Sz4d+IZjnaVivADPdSs12I7WFBj1A3uF6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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