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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a98663703500bea0d7d3e75778a8e8d45c81859cbb8266e884a03ea6de26c83' 
  AND token = 'GHyjOxvpf48PUZQ9FCVmdVSfLdNbNhzdmu35P69bLUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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