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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61268838b8a9b118af0a83c80b562c9a1a621940dcdca790576de9797c0dd5e0' 
  AND token = 'C3F22Feklgz+IPLUN82q5gDYVpjTaoC4SQ0KXF02uBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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