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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8961e2b5fcc3f8d3d18b43ddc190463a2c10d7a00ba6972d5408c7507997fa2b' 
  AND token = 'A8d57B5d5oRgAWo12Bxy2/HbhjtXMA6A07QLxL7zfhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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