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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a616257b582f616135b3065ea5bc00d5d262d760a2451bc5113fa91ae4ec94d' 
  AND token = 'u7jLjY5so5Q8l06YkH9FRlqWAL3BMyJJ2K9vRKkOnVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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