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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06db1bd09318e27b74afc845d5fb9ce0a03bee9f82135570fb6e9be95ef2150' 
  AND token = 'NZt81SLlYz3yvsQeLO/bonU+x6NYTrqirVneG8Xj+Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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