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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8897f2198823601e653c3da947f5e57709011182d394791e135486c9a75e0bdf' 
  AND token = 'AGxss62FGza2Xd8GsY2lp6uzrzGo9x2FwQb+XtioawI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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