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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e319d5a6d5362046c9419b8b9d2a99827df59d6ad18ced3247eecd0356ab57d2' 
  AND token = '5yZNQHDvEn8leYdZQEqUOkyv5y1iBZPSwaO3zGF8oMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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