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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b1ed9a7c7cc477c1353f0a8d1328d604228ca9b209c4fe08ff04b8fb9b2bc2' 
  AND token = 'znlenYmiW8H8kMN25+dKlAKHiCYC4fW9k7l5p1ybqlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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