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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31eb3cd11a4da3b4ef2796f26c85babd16982953433741e263d23bed5a86973' 
  AND token = 'oqHuOSkumQbCWU8l1g3yd46F6MJsrMyXjKm0p/In+pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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