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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0464f45aa666a9c934b116411c2e0c98265732e88475623856a419fadcf002e' 
  AND token = 'gtYv2AUCN2tKSEw29cyuiGu9BmBwRSooVUPABOMdgpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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