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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9a881b3d1bdd62ec3352b4379a356e9da8216926bd147c6401e24d1dd7cd3d' 
  AND token = '2eoBgWASPsxsFv+esR33ymk9jnKyUon+x6P2bFgnbhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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