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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4f715dc0462b7da3722460ada484f730523986e764c5d8d0fc8fbbe71074c3' 
  AND token = 'OZI6785Z4pNERRhXFxVTeLdf93XqL507T+qcB7xS+xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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