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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd73a3d50ba53dd166ef1e95ba7f70ae776907a8bb57c750315bce2c53cb4bd' 
  AND token = '2mFD1NfwyodE4w7wiHwGHS6ij4Tz7rWdES2hKYo+d6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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