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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1aca4c5c3e6b341e807d95c1fc0d3c27c9902697d15bcc225a1d86eebe3f980' 
  AND token = '4rIaoTZgLpMx0p655D7igihvjQX1d0bDqJDw2X00fRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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