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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45622159663f888beb994ef3707e92696317e35709d5f3e9476f6b9f08c20c2c' 
  AND token = 'EurMOFLpj+IDb/bU56LSlNg+Snx/VYSLIQo7f6GLlOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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