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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90962d72e58a91589082a59ecc9c0794cbc25c785d7e70cf2db49e189cb8fe60' 
  AND token = '4QQHDCZLyEi5Ss/c0OMEEWj/Lhtb0NXOV2uy1iBImAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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