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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71a7b32ce8032b94af2126309e2cc2a49c39c4930675ff1ba2deb8e3441d0be' 
  AND token = 'Jng2mpzs5bwv2EfL24Xy33LDnBdT3vDbAUdDcv9LYNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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