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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dfcdbbf9e5e4dc07102e6bb923d98be247349cb6034fb2ceee23ca282eff64b' 
  AND token = 'VVO21BWGXAC9GAqQv8T0XSge4z3bITWyQkwU1HvwWlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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