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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85f072e73e890dbc2cc71f7f87078a5889bdecd78f7cb53f822e9ca55bac57a' 
  AND token = '9a4IPeAhbhqIZ8yPZLkv/8f5SuA79rfSv6v1SUu9OwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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