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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31ed4943ab460ad96548699844865f7da49b701427a956bc6caf4585762d482' 
  AND token = 'R5gJLsa65r5K++Nci+0p/Cz0uw5ANmTdwZCe31Cezxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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