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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528c93bd6a5f034d321830a8bbe9c91d3ed50623121c490c15abf1866705b18a' 
  AND token = 'dSL/IxOdVX/HoQqtrPc4LYCFmSZz3DgXUIP1DKIFkTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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