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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ee9766a1b97b0190a0ad4cfc2974ff63d3915f5fca574a09a39e049eebe939' 
  AND token = 'i0FsqTmQ5FH0W4roP8nm2454gxquz8V/DXVRJ3NGL/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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