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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c870c409fb0c96d76a14950b256ccb697c91a888d8dfe3bd9e533a2a16f165f5' 
  AND token = 'flUTLHuIytqiS9VHkfWcka4L1oIjas152ueiO1rKMVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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