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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6effdd0c014666a200d23e0e778bc8975ec672bdd7311080953d5dea3a7225f9' 
  AND token = 'smb7edYND4UMCC+oN6/6AaRPHk8iOnH3R2NWIl1NO2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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