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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7f2e1822a1c03913c928f544548c0b39400292e8f3f10068d4c3675526bb4f' 
  AND token = 'zTMLDsoAH4PHyik1LQXdkn+raT/Dn+GbOcsm6W2F+a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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