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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab545f6cbe47ef996b60d853f50f360c89f81c9326d3057a0a50041af0488e6' 
  AND token = '3r4lbMful1UmF5CAakO50uLeaLEEg+GH/Cygvsa4UY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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