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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf6be5a6d4c18c165173e5cbefed184b8b0f07f60433d0c7ad9b49d7eb5bec7' 
  AND token = '2lWMgSEyr38mysr0g4s+nAwISJeDWlygitaC2Q+3aPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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