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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9989c002852977cd01de0dd456892baaa17d985c70786afde1bddf3b607e833' 
  AND token = '1FA5RE7ojCNT+jzARyaQwu/2ZHiQSlmEzXhUy3n/MLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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