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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94199b63abc4ab8591190c43ee44f1923304dfe5a67cb445bd7a431e1b19501' 
  AND token = 'MUvxP+J6XyX8n395d9I+a/F5RYddjUjMHS8edJV3VuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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