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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c7294971f3ff27a7cee96eab1dd9a7f6e3bdb6ea5d3de9f0f7524012923f89' 
  AND token = '7T9zYmK10HtskeFvJT59M63DfyUr1AXINlS8dJXQJRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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