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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba5bcd536d09ac78ec04ab92af2168cfbf38030539d4529a0571bc3f2277d0b' 
  AND token = '1Em5DSLol+Db039v6PkE/CuPSOWcSHX04bSQle+Pjow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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