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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eaac4bccc928f603dc454252bd85597b9cdf0d4b8f28e4556f2eba618b72a59' 
  AND token = 'PhnLS5iebJlNKpQEWHwZ4629i7tX02U9ooMpMq2Fo2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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