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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '437e47afbcee7d4b4eac326fd9ed34a11adecfee8c0ab8b10f6a425534e28dc0' 
  AND token = 'qPlnNvVVy/GuHvbyVBMTc/wVNxmDCjV6Jui951lpDCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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