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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b878e616780a39859432cceb15499015920fd011e90ff487564c5d13344ce71' 
  AND token = 'Li7J656fd++asG/TO+IwGE5ixUPFuXn2HnR8f/iv8io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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