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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f064511e9befb42a4dad17d6c76b51a1058e5dfeed62299d86491de466a82e' 
  AND token = '1cAOFw33ewizG/b0+Sfep5sqXQbnBB9sjj/BpHNn7Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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