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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee98ae8bfe8fdf56964a66b4d4caecf400193aebabe00cc92334aefc01d3d8a' 
  AND token = '0Q1rHFHS3GAZJVsbr6Qyag/noTLbMzy7PcceZC/45AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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