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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0ebfe6aca8c9d72d679a212877aeea9f6160afbb54aaf9fa26e45bec65a9ae' 
  AND token = 'gCgUhP1B9s68AT8XqdlstCvc2C/Hf4UjW3YRI7Cjlf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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