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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264ee393be5e79da0a12ee0463366a3271689b3a55ba5f0a1f07fb8241e80bf9' 
  AND token = 'o3sRGPr8AUlmf3JaXAPyouoihY6sCe/1D/G05Q9QFlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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