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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd00d567ec9dacd2ff288d3d2a5a571456cd91c30604694315c06fba4a57d13f' 
  AND token = 'hqc6ZuO6PkOJpp1kmJitufwdQFu11ZSYdz3yK7+hbug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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