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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56da382e0a1d9264f30bcd2a7c1a74afe02398143d56ac0be5460d7994ab08b6' 
  AND token = 'r42XW20ZAEH+hsDr8XFOEStAsvzS8/QYQhVN96lPtAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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