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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f998a852238d29a42b05d3ba0880c9efd1d53010b1aa4c22100e292acaae2ef' 
  AND token = 'QEvSfasBVWPvFHjdhyHG3Cro3B5LG29jjbzZyg4qymk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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