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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c536f6baa5ba66587e74bb3cc6a2b5ee862acf75becf4144092fa8c8993ffd' 
  AND token = '5bnnL32v/PF8kkXzRAtsO2VnGq+1xXFO3MEan8ziAuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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