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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bccbb005f5183603f39791b98528a8d92cc15c34dbc8cf3bd45c7c86b7cb69' 
  AND token = '/rV4ZWVUBDfVp0lz5mixf0m50S1ldcMUhYo8JBURrUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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