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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baabb8567d772b8fcc95a391b996205ea1038b6dd5fb1b00c556b6329cb12014' 
  AND token = '35/SkQ/vjL4MV9RhHKzh2XMeEJwAzCF2GpM6U3T5Hh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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