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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e87e8da009a1411f97cfc08809333a1dd4ec7813e53506be0955da7c7a5e7e' 
  AND token = 'rwGk7fylPpv/wCI5Aueu4V+nlOgBevdi+iXXX9bKODY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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