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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f88be32ec19dab30e83e9fa4286e3b4191196a95d0af1b6d7247f58fbe1c04' 
  AND token = 'bM3IMO785i6JmbECOkRnlax0ILA/m8lPn2KnYNKftYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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