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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f09057e7cc70e7097630b4bfeb7845c973b215325eed880c1d89d8b345a674' 
  AND token = '9rITXFh0tF2zgQf/EOz+Hkpj81wOpcLCX4L1NYBbSHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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